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Wetting Behavior of Zn-Al Liquid on Si-Containing Steel After Surface Oxidation and Reduction Treatment

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Abstract

In the hot-dip galvanization of steel products, surface oxidation–reduction treatment has been proposed recently to improve the wettability of liquid Zn-Al alloy on Si, Mn-containing high-strength steel. During surface oxidation–reduction treatment, an iron-oxide layer with a nanoscale thickness is formed on the steel surface, which is reduced to a metallic iron layer. Although elemental Si and Mn in steel react with oxygen in the atmosphere to form oxide phases, these oxides are expected to be trapped under a reduced iron layer. However, optimum oxidation–reduction conditions have been explored to achieve a good wettability of the liquid Zn-Al alloy on the steel surface. In this study, the dynamic wetting behavior of liquid Zn-Al alloy on the surface of the Si-containing steel after oxidation–reduction treatment was observed by the sessile drop method. It was found that the wettability of the liquid Zn-Al alloy on Si-containing steel depends significantly on the oxidation–reduction condition of steel, despite the Si content in steel being fixed. A porous structure formed in the reduced iron layer accelerates liquid Zn-Al alloy wetting through a capillary force, whereas oxide phases exposed to the steel surface prevent liquid alloy wetting.

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Acknowledgments

The results of this study were obtained from Research Grant II “Development of high-quality molten zinc galvanization and nanoscaled analyses,” which was supported by the Iron and Steel Institute of Japan. The authors express their warmest gratitude to the committee for their fruitful suggestions. We thank Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript.

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Authors and Affiliations

  1. Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan

    Masanori Suzuki & Toshihiro Tanaka

  2. Steel Research Laboratories, JFE Steel Corporation, 1 Kokan-cho, Fukuyama, Hiroshima, 721-8510, Japan

    Yusuke Fushiwaki & Yusuke Okumura

Authors
  1. Masanori Suzuki
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  2. Yusuke Fushiwaki
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  3. Yusuke Okumura
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  4. Toshihiro Tanaka
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Correspondence to Masanori Suzuki.

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Manuscript submitted June 3, 2019.

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Suzuki, M., Fushiwaki, Y., Okumura, Y. et al. Wetting Behavior of Zn-Al Liquid on Si-Containing Steel After Surface Oxidation and Reduction Treatment. Metall Mater Trans B 51, 467–479 (2020). https://doi.org/10.1007/s11663-020-01782-3

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  • DOI: https://doi.org/10.1007/s11663-020-01782-3

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